New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422

Details New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422 New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422

2007-08-17

arxiv.org/abs/0708.2420v1

Astronomy and Astrophysics

Astrophysics

21 pages, 6 figures, accepted by ApJ

Scientific paper

10.1086/522568

In this article, we report high-resolution (~ 0.1" -- 0.3"), high-sensitivity (~ 50 -100 uJy beam-1) Very Large Array 0.7 and 1.3 cm observations of the young stellar system IRAS 16293-2422 in rho-Ophiuchus. In the 0.7 cm image, component A to the south-east of the system looks like its usual binary self. In the new 1.3 cm image, however, component A2 appears to have split into two sub-components located roughly symmetrically around the original position of A2. This change of morphology is likely the result of a recent bipolar ejection, one of the very first such events observed in a low-mass source. Also in component A, a marginal detection of 0.7 cm emission associated with the submillimeter component Ab is reported. If confirmed, this detection would imply that Ab is a relatively extended dusty structure, where grain coagulation may already have taken place. With an angular size increasing with frequency, and an overall spectra index of 2, the emission from component B to the north-west of the system is confirmed to be dominated by optically thick thermal dust emission associated with a fairly massive, nearly face-on, circumstellar disk. In the central region, however, we find evidence for a modest free-free contribution that originates in a structure elongated roughly in the east-west direction. We argue that this free-free component traces the base of the jet driving the large-scale bipolar flow at a position angle of about 110 degrees that has long been known to be powered by IRAS 16293-2422.

Affiliated with

Also associated with

No associations

Rating

New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Radio Sources and the Composite Structure of Component B in the Very Young Protostellar System IRAS 16293-2422 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-6297